1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at http://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23#include "timeval.h" 24 25#if defined(WIN32) && !defined(MSDOS) 26 27struct timeval curlx_tvnow(void) 28{ 29 /* 30 ** GetTickCount() is available on _all_ Windows versions from W95 up 31 ** to nowadays. Returns milliseconds elapsed since last system boot, 32 ** increases monotonically and wraps once 49.7 days have elapsed. 33 */ 34 struct timeval now; 35 DWORD milliseconds = GetTickCount(); 36 now.tv_sec = milliseconds / 1000; 37 now.tv_usec = (milliseconds % 1000) * 1000; 38 return now; 39} 40 41#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC) 42 43struct timeval curlx_tvnow(void) 44{ 45 /* 46 ** clock_gettime() is granted to be increased monotonically when the 47 ** monotonic clock is queried. Time starting point is unspecified, it 48 ** could be the system start-up time, the Epoch, or something else, 49 ** in any case the time starting point does not change once that the 50 ** system has started up. 51 */ 52 struct timeval now; 53 struct timespec tsnow; 54 if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) { 55 now.tv_sec = tsnow.tv_sec; 56 now.tv_usec = tsnow.tv_nsec / 1000; 57 } 58 /* 59 ** Even when the configure process has truly detected monotonic clock 60 ** availability, it might happen that it is not actually available at 61 ** run-time. When this occurs simply fallback to other time source. 62 */ 63#ifdef HAVE_GETTIMEOFDAY 64 else 65 (void)gettimeofday(&now, NULL); 66#else 67 else { 68 now.tv_sec = (long)time(NULL); 69 now.tv_usec = 0; 70 } 71#endif 72 return now; 73} 74 75#elif defined(HAVE_GETTIMEOFDAY) 76 77struct timeval curlx_tvnow(void) 78{ 79 /* 80 ** gettimeofday() is not granted to be increased monotonically, due to 81 ** clock drifting and external source time synchronization it can jump 82 ** forward or backward in time. 83 */ 84 struct timeval now; 85 (void)gettimeofday(&now, NULL); 86 return now; 87} 88 89#else 90 91struct timeval curlx_tvnow(void) 92{ 93 /* 94 ** time() returns the value of time in seconds since the Epoch. 95 */ 96 struct timeval now; 97 now.tv_sec = (long)time(NULL); 98 now.tv_usec = 0; 99 return now; 100} 101 102#endif 103 104/* 105 * Make sure that the first argument is the more recent time, as otherwise 106 * we'll get a weird negative time-diff back... 107 * 108 * Returns: the time difference in number of milliseconds. 109 */ 110long curlx_tvdiff(struct timeval newer, struct timeval older) 111{ 112 return (newer.tv_sec-older.tv_sec)*1000+ 113 (newer.tv_usec-older.tv_usec)/1000; 114} 115 116/* 117 * Same as curlx_tvdiff but with full usec resolution. 118 * 119 * Returns: the time difference in seconds with subsecond resolution. 120 */ 121double curlx_tvdiff_secs(struct timeval newer, struct timeval older) 122{ 123 if(newer.tv_sec != older.tv_sec) 124 return (double)(newer.tv_sec-older.tv_sec)+ 125 (double)(newer.tv_usec-older.tv_usec)/1000000.0; 126 else 127 return (double)(newer.tv_usec-older.tv_usec)/1000000.0; 128} 129 130/* return the number of seconds in the given input timeval struct */ 131long Curl_tvlong(struct timeval t1) 132{ 133 return t1.tv_sec; 134} 135